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Sinclair International
Sinclair Shoulder Bump Gage Insert #40A 40 Degree 25-338/Ackley
Sinclair Shoulder Bump Gage Insert #40A 40 Degree 25-338/Ackley
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The Sinclair Shoulder Bump Gage Insert #40A is a precision reloading tool built for 40-degree shoulder cartridges, specifically the 25-338/Ackley. It works with Sinclair bump gage systems to measure case shoulder position.
For handloaders running Ackley Improved cartridges, this insert helps set consistent shoulder bump, supporting proper chambering, accuracy, and case life.
Key Features
| Brand | Sinclair International |
| Product Type | Shoulder Bump Gage Insert |
| Model | #40A |
| Caliber | 25-338/Ackley |
| Shoulder Angle | 40 Degree |
| Compatibility | Sinclair Bump Gage Systems |
| Condition | New |
Compatibility
Compatible with Sinclair bump gage systems and designed for 25-338/Ackley cartridge cases with a 40-degree shoulder.
Frequently asked questions
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